Elena, your 5th house looks like a mixed bag to me. Since the traditional vs. modern astrology debate has become such a hot topic on some other threads, I will say that I am a modern astrologer, but I give due credit to traditional astrologers who do excellent work.
The ruler of your 5th house is Jupiter, so that looks good. But it squares Pluto and conjuncts Chiron, which looks bad. Also, your Mercury in the 5th is part of a Thor's Hammer, which is a very volatile and stressful formation, occuring when two planets square each other and form a sesqui-square to a third planet. Mercury is also opposed by Uranus. I would read this combo as indicating some good fortune, but subject to sudden and possibly serious reverses.
The thing about investments is that it depends upon what type they are. Some are conservative and about as safe as you can get. These days, they generally have a miniscule rate of interest, but they might just still be there for you when you need to draw on them. These belong in the 8th house, along with inheritances and money that would be considered a joint asset of a marriage.
Other investments are highly speculative and risky--with higher potential earnings but also a higher risk of loss. These might be 5th house territory, especially if the investor perceives them more in a recreational sense. So far as I can make out, gambling belongs in the 5th as a house relating to enjoyable leisure pursuits, so Las Vegas slot machines, yes; your retirement portfolio, no.
And then, your own money is a 2nd house matter, but these days not too many people put substantial sums under the mattress. If you put it in your checking account, the bank can still loan it out to someone else.
Frankly, I think the best thing people can do is to learn basic skills of how to manage the money they have. Too many people either earn good money, get an inheritance, or win the lottery, but the money gets away from them because they are clueless about personal finance basics.