The names of your matches aren't always that helpful (people are adopted, change name, or have a different father to the one in their tree).
I don't know what you've done already, but you need to look at the matches that you have in common with each match – in Ancestry the people who are listed on the 'Shared matches' tab.
I'd suggest using the group function in Ancestry to label your shared matches, eg. take your closest match and choose a coloured group for them (where it says 'Add/edit group'). Then apply that colour to all of their shared matches.
Go back to your list of matches, find the next closest match who doesn't already have a group, and choose a different colour. Then go to their list of shared matches and give them all the same colour too.
Eventually you'll have organised your matches into groups based on who they are related to. If you can then work on how they are related and identify their "common ancestors", those ancestors may well be yours too.
The Leeds method is basically the same thing but suggests creating a spreadsheet.
If you are looking to identify your father it would be well worth uploading your data to the other sites I mentioned, as there will be relatives there who haven't tested with Ancestry or 23andMe. Gedmatch is another place you can do the same (horrible design though).