Later, Myboto was Secretary of State at the Presidency in charge of Information from 4 February 1978 to 26 February 1980 and Minister Delegate at the Presidency in charge of Information, Posts and Telecommunications from February 1980 to 1981. He was then promoted to the position of Minister of Information, Posts and Telecommunications in 1981, and he held that post until February 1990, when he was instead appointed as Minister of Public Works, Equipment, Construction, and Urban and Regional Planning. After 17 years as the PDG's Administrative Secretary, he left that post in January 1990. In the September 1990 parliamentary election, he was elected to the National Assembly as a PDG candidate from the second seat of Lemboumbi-Leyou Department (Mounana), located in Haut Ogooué Province.