Just swap all your shitcoins for Bitcoin.
Bitcoin has been the most profitable investment of the past decade, and it looks like it also going to be the most profitable one of the decade ahead. If it maintains that rate of return, you only have to hold $1,000 in Bitcoin for 6.5 years it to turn into a million.
Till now bitcoin turned many into millionaires who had the patient to hold for a long time but with the price rallying a lot you cannot expect the same kind of profit like the earlier investors used to get. There are other coins in the market that rallied along with bitcoin especially coins with lower valuation and if you are holding those you could make a huge profit as well and some of these coins gave bigger returns than bitcoin.
Personally i do not trust holding the coins in exchanges let alone lend them.
Investing in Bitcoin alone is very risky, especially if you have to lend it only for interest. How much interest is offered for sure will not be better than the profit made from investing in Bitcoin. From March 2020 to the present, bitcoin prices have even touched approximately 500% in just 11 months. Who is able to provide interest more than the gain from investment. If anything, it's probably just a scam.