Dude, congratulations on the transformation! So, you’re not new to training and you’re not new to nutrition, but you ARE new to gaining clean and lean weight. That makes things a bit simpler, in some regards.
When you do get down to your goal weight (always hit a goal if you have it and are able to hit it!), you don’t need to ‘bulk’ (aka eat a shit ton of extra calories). Think about it like this: You’ve been in a caloric deficit for a long time now (I’m assuming). Thus, any increase in calories will help to add weight because your body is used to a certain amount of intake.
My opinion is to do a reverse dieting schema. When you’re ready to add size, just add 100-200 calories a day for 7-10 days. After you’ve been in that increase for a week or so, add another bump, and so on and so forth. In such a fashion, your body should be able to adjust and process rather than hoard all the excess. I’m not sure how long you can continue that caloric increase process, but your body should tell you when it has had enough and stops processing what you give it…and that’s your cue to pull back on the food again.
Good luck, brother!