In 2018 I talked to an astrologer and she told me my progressed Venus squares Saturn and for the next 3-4 years love/relationships and money wouldn’t be great.
That's kind of a lazy way out. Venus is considered the natural ruler of the second house (money, personal possessions) and the seventh (relationship/partnership) because of their vibes with Taurus and Libra, respectively. However, Venus in your personal chart has the most say over the house it's placed in and the houses with their cusps in Taurus and Libra. More often than not, that's different from the second and seventh.
In your case, Venus does rule the second house - cusp in Libra - but not the seventh, and it's not placed in either of those houses. Still, though, progressed Venus squaring natal Saturn isn't where I'd expect to see much in the way of Saturn problems (slowness, delay, that kind of thing). Transiting Saturn squaring natal Venus, or perhaps sitting on progressed Venus, would be more likely to have that effect.
Since you have so many placements in late Libra, and they happen to be in your second house, you've had that sector of your chart really walloped in the last couple of years, with the square in 2020 - early 2021 from Saturn/Jupiter/Pluto in Capricorn. Financial issues may correlate with that.
I just started a business and have a business partner, money has been very slow coming in and I’ve hit the pause button on dating.
If you just started the business, of course money is slow coming in. New businesses almost never start making money that fast. It usually takes three to five years to start turning a profit.
Slowness and pause buttons are Saturn, but progressed Venus square Saturn wouldn't be the cause. Look at what else Saturn's doing with transits and progressions in your chart.
On the benevolent side, Saturn is about taking it slow and getting it right the first time, and stopping to re-evaluate when a situation isn't working for you. Are you taking care to set up your business right? That's a Saturn gift. Stopping dating because it wasn't working out for you? Also a Saturn gift.
Do I have any transits happening that could soften this progression or help improve my situation? I’m hoping for success with my business partner and to improve my financial situation, would also love to meet someone and get married but I’m feeling a little hopeless. Any insight you could provide would be much appreciated!
For relationship issues, the first place to look is your seventh house and its ruler(s). Since Venus is not the ruler of your seventh house and not placed in your seventh house, its transits and progressions wouldn't have such a direct effect on your love life, although they can make some general statement about how you yourself are currently seeing, and approaching, Venusian things. For how your seventh house sector is going, look to Jupiter. Neptune may fill in a few additional details, as the modern ruler of your seventh.
From your last birthday until your upcoming one, you have Jupiter as your time lord. That highlights the topics of the second, fourth, and seventh houses for you, because your natal Jupiter is in the second and it rules your fourth and seventh.
If you were having issues with money and relationships to begin with, they're in sharp relief right now, and probably extra difficult because at your last solar return, Jupiter was in Capricorn, its detriment sign, which greatly constricts its expansive energy. That gives it less power to help you out in those areas. It's kind of like having a nice boss at a dysfunctional company with a grandboss who undermines them at every turn: the boss can try to make your life easier, but their hands are mostly tied.
That also means those things move with the slowness of Capricorn. On your upcoming birthday, your time lord will change to Saturn, and the highlighted houses will shift, although since Saturn is also in your natal second, that leaves the second house highlighted. Saturn currently being in Aquarius gives it some extra power to help you out - Aquarius being a traditional domicile of Saturn - and Aquarius brings out the lighter side, if you can call it that, of Saturn. This next year could be a time when, if you've managed your business right, the finances start looking more solid.