Hi i see the network of bitcoin have not many miners like i thought because of pools i guess, is it possible then
to start solo mining for example with 25 TH/s and catch block with little luck??
Thank you in advance for your time.
A straight answer to your question is no your effort is not value for the time spent to find the block.
Your 25TH is a little more, but that's not enough to think to do solo mining.
If you only want to consider it as a lottery then try it, but power consumption will be a major issue.
Consider pool mining with your 25TH if you get more than what you spend on electricity charge.