i still have to say, I look at that seat and it just screams uncomfortable due to its design.
its not always better to go for a gel design either. without going into it too much, it comes down to whats known as "sit bones" for which is the best type. although from my own background I have done a bit of trial and error and know what im happy with.
the problem I am seeing is that you may not want to spend much at all on the bike overall, and I don't blame you.
but as others have said, a proper bike fit would do a world of good.
also looking at it, without being able to see too much, it appears it may also be on the smaller side, leaving you overall cramped.