Not everyone writes but some people find it easier to remember if you hand write kanji. Here’s a few things that I do!
Master stroke order. Often kanji will look like a big mess of things, and it’s even harder to visualize or write them down if you can’t first break a character down into its smaller pieces. Learn the rules of stroke order, and practice them on the new radicals you learn!
Like some already mentioned, practice writing them in every day vocabulary. This will take them from being abstract concepts from your mind and turn them into something more every day, so you’re more likely to remember them. I think keeping a daily journal of 3-5 sentences in Japanese using vocabulary words you’ve learned is a good place to start. (it can be something as simple as 今日、この言葉を勉強しました！）
Expose yourself to new sentences using the kanji you are learning. Whether you go read picture books or look for examples from a dictionary, it always helps to see words you want to write being put into use.
I use the app HelloTalk to have native speakers correct my grammar on what I’ve written for the day before immortalizing it in ink, too, to reinforce good grammar if I were to ever look back and read old entries. I also get to see things written by Japanese people on there, or else hop into Japanese Twitter to see other people saying things in everyday ways.
Some people want to master writing every kanji, and memorize them perfectly, but remember that not even native Japanese speakers can perfectly write every kanji beyond a certain point. Unless you plan on taking the kanken or need to prove your kanji worth in a 闇のゲーム, try not to push yourself too hard and burning yourself out!