As you can see from this Time Tree, H-Y21630 has four main branches. The Boyt branch goes straight down on the left to Y21630 > BY37186 > BY37188 (HighCross, Boyt Surnames start). You can place your curser over the SNP Circle and Flag Circle for more information. All of the Boyt branches are on this tree. Lookup your BigY SNP and find your location on the tree under BY37188. All US lines are under BY37194.
https://discover.familytreedna.com/y-dna/H-Y21630/tree

REEVES branch (John Reeve b. 1561 and d.1621 England). To the Virginia Colony. This Reeves Project member is Y21630>Y21598>BY16702>FGC31857>FT2131>Y64823>Y67509. You can see his branch also going straight down, just to the right of the Boyt branch.

LEWIS branch (John Lewis b. 1748 VA d 1835 IN). This Lewis Project member is Y21630>BY40831>FTE87988. You can see his branch going directly to the right to SNP BY40831 (about 1761 in VA, Surname Reeves). He does not appear to have any historical migrations across England. Makes me wonder about Ireland during the medieval times. Will need more family information.

FOWER branch (Richard Fowler (1535-1584) United Kingdom) IN53875 Fowler H-FT205369 Big Y-700
Y21630>S86>FT205369

This is all four of the known branches. I could not find any exact matches for this Fowler line. It has an International kit# number so they may live in the UK. https://www.familytreedna.com/public/fowler?iframe=ydna-results-overview
This is a group of one and number 72 on the project page.
H-L901>P96>Z19008>Z19080>SK1180>Z19072>Z19089>Z19049>SK1182>Y20839>Y21630>S86>FT205369


Hap H (H-Y21630), according to Family Tree DNA, Source Discover H-Y21630:
There are 60 DNA tested descendants, and they specified that their earliest known origins are from: United States, United Kingdom, England , and 7 other countries