Do not try to make up losses dollar for dollar. The markets do not know what you lost and will not sympathize. Markets Pay For Taking Risk. The less risk, the less reward. Know how much risk you are willing to take, and set the amount of profit you seek.
All stocks carry risk.
What Makes Things Better, Don't Do What Makes Things Worse. It is better to buy something that is going UP, and Sell something that is going Down. Adding more when something is good, makes it better. More of something bad, usually makes things worse. Always Keep Some Dry Powder.