Looking for a fund for your trading can be relatively difficult given its nature. You can ask for a loan in banks but you must be absolutely sure that you can pay your balance within the time-frame stipulated on your contract. Generally, I would advise against this given the amount of risk involved. But since you mentioned that you have four (4) years of experience, then the chances of you losing your money is relatively lower compared to others who little-to-no experience at all.
I don't think it's really advisable to make a bank loan for trading needs. The market is never always profitable over a period of time, so no one can really make profits consistently. After all, in my opinion trading doesn't have to be so forced when traders don't have a lot of capital, I mean they can still trade with the funds even though it's not much.
Another suggestion would be to save the profit you have earned overtime. In this method, you will risk all the profits you have realized and use it as your capital if you focus on trading big trade setups.
This will be very relative, unless the trader does not use his profits for daily needs. Accumulating profits as additional capital is always good, but those funds should not be touched for daily needs.