I think AS-Path is correct.
BGP first look at AS-Path attribute, here router in AS 300 will learn 10.10.10.0/24 prefix from router in AS 100 with 1 Path length and will learn 10.10.10.0/24 prefix from router in AS 200 with 2 paths length.
You need a route-map on router in AS 100 that prepend the AS path length so that router in AS 300 learn 10.10.10.0/24 prefix from router in AS 100 with 3 Path length.
BGP Attributes
Priority Attribute
1 Weight
2 Local Preference
3 Originate
4 AS path length
5 Origin code
6 MED
7 eBGP path over iBGP path
8 Shortest IGP path to BGP next hop
9 Oldest path
10 Router ID
11 Neighbor IP address
You also could configure Weight attibute on router in AS 300 so that it choose router in AS 200 as better path, but I think that the idea here is to make router in AS 100 controls the network.
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