From your photo you look like a Norwood 5, maybe even a 6 or heading that way.
-You can consider either having one large surgery via FUE with a top surgeon over two days for 4k grafts, or have one session of say 3k then come back for another FUE session of 2k a year later if you have the grafts available.
-Or go down the FUT path first, then do FUE when you've exhausted the strip over 1-2 operations. You need a lot of grafts, 4k isn't a lot for that area.
I've always thought for advanced Norwood levels such as yourself, it's worth getting all you can from FUT FIRST then doing a FUE later in life if needed. Personally that's my plan, as people like us need a lot of grafts to cover the large area & we have to use our resources over a number of years to obtain nice results. Just an opinion.