Restarting can be a good way to refresh the gameplay, and give you some new things for a week.
RS Tent, prologue music, quests from Tom Nook, an island covered in weeds. That nice feeling of a brand new island to explore and set up. After that week, you'll have your new island to set up how you'd like.
but at the same time, since there is no New Game+, you will lose all your DIYs, catalogue, and storage. Losing all the clothing items I've collected alone makes it hard me to do a reset.
Making the island all flat on the other had is very very monotonous, and then you'll need to work hard at making rivers and cliffs look natural. And moving trees, flowers, buildings, and bridges and inclines around in the process is another challenge.
You'll need to weigh the pros and cons of each and make the decision that best works for you. If you do end up resetting, there are some of us here (myself included) that would be happy to get you some DIYs, fruits, and some other things.