Only you can say, mate. Some do not want to sell at all. Rain or shine, they keep holding. It’s fine. But if you want to sell, you need to consider the price you bought it and the possible price you can sell it. If you like the results then okay go ahead. If you see a price high enough that is satisfying enough then that’s the time to sell.
Like I said, it all depends on how much you bought it for and whether you can see significant returns if you sell now. But to me, yes, this can be a very good method. Selling when high and buying when it’s low again.