Do you recommend a full reset after a 5 year hiatus?

If you remember most of the kanji and words from before level 8, there’s no reason to reset to a level lower than that. It’s easy enough to review the new radicals on your own using [Userscript] Self-Study Quiz or similar if you think that would be helpful. Keep in mind that it’s always possible to reset to an even lower level again later if you decide level 8 is still too tough, but once you reset to level 1 you can’t undo that.