Building Links for years to come

There was a time when every Link was Link. Fast forward 2017, I follow this strategy. Please add your thoughts.
Tier 1 Links:
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1. PBN, PBN, PBN all the way [50% links]
2. Guest posts
3. Well managed social media presence
4. Youtube videos work good for me
5. Web 2.0 property (Not those 1 page orphan pages, rather mini money site built on web 2.0)

Tier 2 Links:
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Bulk Links using RankerX (I don't touch PBN Links in tier 2)

Tier 3 Links:
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Google Indexer Services

Feel free to give in your inputs....

Forum links are very useful just try to find discussion based on your keyword and place your link wisely so that it ads value to the conversation. This will also help you a lot !

Exclude PBNs post if you want to build links for years to come. You better go with natural link building and do guest posting as much as you can.